On the ground state and excitations of a four-component fermion model
You-Quan Li, Guan-Shan Tian, Michael Ma, Hai-Qing Lin
Abstract
The properties of the ground state and excitations of a four-component Hubbard-like model are studied by the Lieb-Schultz-Mattis approach. It is proven rigorously that the ground state of the model is nondegenerate and excitations are gapless at all band fillings.
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